On Aug 26, 2005, at 3:03 AM, Daniel Krech wrote:
On Aug 25, 2005, at 3:10 PM, Michel Pelletier wrote:
On Thu, 2005-08-25 at 14:32 -0400, Gary Poster wrote:
see what he thinks. I wonder how "lite" the component kernel
can go.
The only thing I have in mind is the interface package, which is
what
Twisted uses. That's all we would need. zope.component needs
zope.interface, zope.testing, and zope.exceptions, according to its
DEPENDENCIES.cfg.
Right. Well in this case we would provide just a very simple
interface
facade that had no effect when run in an environment with no
zope.interface (ie, catch the ImportError, null-out the facade) or
hook
into zope.interface if it is available. This way rdflib can be
still be
used with or without zope.interface.
Sounds good.
OK, cool.
In the mean time the adapters can live inside Zemantic, which is an
rdflib to zope bridge anyway. Let me know if you want to send
patches,
otherwise I'll probably get around to adding functionality like
this
soon.
I'm actually interested in trying to hook this up, but have very
limited time. I might play with it just within RDFLib alone during
some hobby time tonight, but otherwise may need to toss this off to
you if you'll catch it.
I also kind of want to hear Dan's reaction before I spend too
much time.
#redfoot on freenode is a good place to catch him, and me.
Yep, feel free to stop by anytime.
OK, cool, I plan to again. :-)
I thought I read that an RDF triad was itself something that
could be
a node in another RDF triad, but I can't find that anywhere now.
Can
you confirm or deny? :-)
Yes, it's called reification, making a statement about a statement.
http://www.w3.org/TR/rdf-primer/#reification
http://en.wikipedia.org/wiki/
Resource_Description_Framework#Statement_reification_and_context
http://www.w3.org/TR/rdf-mt/#Reif
Reification is probably best avoided. I'd recommend seeing if you
can make use of a context or quoted graph instead.
I have read that 'context' actually is still a word looking for a
firm definition in RDF, but I like the interpretation that it is the
source of the assertion. That's not a general answer for the sorts
of things that reification can provide, though.
The quoted graph does seem interesting: I said before that it seems
very similar to reification, and it does, but I guess it subsumes the
data structure that reification can provide...I also said that I
wonder about efficient indexing, and I still do.
On the plus side for context, you've implemented it. ;-)
I'm interested in contemplating RDF as a full catalog solution for
Zope, at least as a thought experiment. The SPARQL work seems
interesting, in regards to some of the recent discussion on the Zope
3 list; and the ability to seamlessly and simultaneously query both
relationship information between objects and more traditional catalog
data seems compelling.
It seems to me that allowing a back end to index particular
relationships--and joins, particularly through blank nodes--would be
a big step in letting RDF actually be a front end to a full catalog.
Another step would be having a front end that honored rdfs range and
domain constraints.
I plan to get on IRC and bother you all again as soon as I have time
to do so. :-)
Gary
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